TANDBERG Border Controller User Manual

6URI Dialing

If an alias is not located in the Border Controller’s list of registrations, it may attempt to find an authoritative Gatekeeper through the DNS system.

URI dialing makes it easier for endpoints registered with different Gatekeepers or Border Con- trollers to call each other. Without URI dialing, you need to neighbor all the systems to each other. This does not scale well as the number of systems grows. It is also inconvenient for making one off calls to endpoints registered with previously unknown systems.

Using URI dialing, you call using an H.323 URI which looks like an email address. The destination Gatekeeper is found from the domain name — the part after the @ — in the same way that an email server is found.

The decision as to whether or not to use URI dialing is governed by the current state of:

xConfiguration Gatekeeper DNSResolution Mode: <On/Off>

or using the web interface on the Border Controller Configuration → Gatekeeper page

You will also need to configure a DNS server for the systems to query. This is set using:

xConfiguration IP DNS Server 1 Address: <address>

or using the web interface on the System Configuration → IP page (see Figure 14 for the IP Configuration screen).

If you want others to be able to reach you using URI dialing, add a record to your DNS information as described in Appendix: A

Endpoints will typically register with the Border Controller without their domain name. The Border Controller needs to match a request for fred@example.com to a registration for fred. To do this, it must be configured with the name of the domain in which its endpoints belong. This is set using

xConfiguration Gatekeeper LocalDomain DomainName: <name>

If URI dialing is being used in conjunction with firewall traversal, DNSResolution Mode should only be enabled on the Border Controller and on any Gatekeepers on the public network. The DNS records should be updated with the address of the Border Controller as the authoritative Gatekeeper for the enterprise. This ensures that calls placed using URI dialing enter and leave the enterprise through the Border Controller, allowing successful traversal of the firewall.

The LocalDomain DomainName should be set on both the Gatekeeper and the Border Controller. Any Alternates should also have the same LocalDomain Domain Name.

6.1Creating DNS SRV records

URI dialing relies on the presence of SRV Record in the DNS information for the zone. The SRV record specifies the location of a server for a particular protocol and domain. Its format is defined by an Internet standard [3] as

Service. Proto.Name TTL Class SRV Priority Weight Port Target

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TANDBERG D13691.03 user manual URI Dialing, Creating DNS SRV records
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